# Uses of Interface
java.lang.foreign.MemorySegment

Packages that use MemorySegmentPREVIEW
Package
Description
java.lang.foreign
Provides low-level access to memory and functions outside the Java runtime.
java.nio.channels
Defines channels, which represent connections to entities that are capable of performing I/O operations, such as files and sockets; defines selectors, for multiplexed, non-blocking I/O operations.
jdk.incubator.vector
Incubating Feature. Will be removed in a future release.

## Uses of MemorySegmentPREVIEW in java.lang.foreign

Fields in java.lang.foreign declared as MemorySegmentPREVIEW
Modifier and Type
Field
Description
`static final MemorySegmentPREVIEW`
MemorySegment.`NULL`
A zero-length native segment modelling the `NULL` address.
Methods in java.lang.foreign that return MemorySegmentPREVIEW
Modifier and Type
Method
Description
`default MemorySegmentPREVIEW`
Arena.`allocate(long byteSize, long byteAlignment)`
Returns a native memory segment with the given size (in bytes) and alignment constraint (in bytes).
`default MemorySegmentPREVIEW`
SegmentAllocator.`allocate(long byteSize)`
Allocates a memory segment with the given size.
`MemorySegmentPREVIEW`
SegmentAllocator.`allocate(long byteSize, long byteAlignment)`
Allocates a memory segment with the given size and alignment constraint.
`default MemorySegmentPREVIEW`
SegmentAllocator.`allocate(AddressLayoutPREVIEW layout, MemorySegmentPREVIEW value)`
Allocates a memory segment with the given layout and initializes it with the given address value.
`default MemorySegmentPREVIEW`
SegmentAllocator.`allocate(MemoryLayoutPREVIEW layout)`
Allocates a memory segment with the given layout.
`default MemorySegmentPREVIEW`
SegmentAllocator.`allocate(ValueLayout.OfBytePREVIEW layout, byte value)`
Allocates a memory segment with the given layout and initializes it with the given byte value.
`default MemorySegmentPREVIEW`
SegmentAllocator.`allocate(ValueLayout.OfCharPREVIEW layout, char value)`
Allocates a memory segment with the given layout and initializes it with the given char value.
`default MemorySegmentPREVIEW`
SegmentAllocator.`allocate(ValueLayout.OfDoublePREVIEW layout, double value)`
Allocates a memory segment with the given layout and initializes it with the given double value.
`default MemorySegmentPREVIEW`
SegmentAllocator.`allocate(ValueLayout.OfFloatPREVIEW layout, float value)`
Allocates a memory segment with the given layout and initializes it with the given float value.
`default MemorySegmentPREVIEW`
SegmentAllocator.`allocate(ValueLayout.OfIntPREVIEW layout, int value)`
Allocates a memory segment with the given layout and initializes it with the given int value.
`default MemorySegmentPREVIEW`
SegmentAllocator.`allocate(ValueLayout.OfLongPREVIEW layout, long value)`
Allocates a memory segment with the given layout and initializes it with the given long value.
`default MemorySegmentPREVIEW`
SegmentAllocator.`allocate(ValueLayout.OfShortPREVIEW layout, short value)`
Allocates a memory segment with the given layout and initializes it with the given short value.
`default MemorySegmentPREVIEW`
SegmentAllocator.`allocateArray(MemoryLayoutPREVIEW elementLayout, long count)`
Allocates a memory segment with the given element layout and size.
`default MemorySegmentPREVIEW`
SegmentAllocator.`allocateArray(ValueLayout.OfBytePREVIEW elementLayout, byte... elements)`
Allocates a memory segment with the given layout and initializes it with the given byte elements.
`default MemorySegmentPREVIEW`
SegmentAllocator.`allocateArray(ValueLayout.OfCharPREVIEW elementLayout, char... elements)`
Allocates a memory segment with the given layout and initializes it with the given char elements.
`default MemorySegmentPREVIEW`
SegmentAllocator.`allocateArray(ValueLayout.OfDoublePREVIEW elementLayout, double... elements)`
Allocates a memory segment with the given layout and initializes it with the given double elements.
`default MemorySegmentPREVIEW`
SegmentAllocator.`allocateArray(ValueLayout.OfFloatPREVIEW elementLayout, float... elements)`
Allocates a memory segment with the given layout and initializes it with the given float elements.
`default MemorySegmentPREVIEW`
SegmentAllocator.`allocateArray(ValueLayout.OfIntPREVIEW elementLayout, int... elements)`
Allocates a memory segment with the given layout and initializes it with the given int elements.
`default MemorySegmentPREVIEW`
SegmentAllocator.`allocateArray(ValueLayout.OfLongPREVIEW elementLayout, long... elements)`
Allocates a memory segment with the given layout and initializes it with the given long elements.
`default MemorySegmentPREVIEW`
SegmentAllocator.`allocateArray(ValueLayout.OfShortPREVIEW elementLayout, short... elements)`
Allocates a memory segment with the given layout and initializes it with the given short elements.
`default MemorySegmentPREVIEW`
SegmentAllocator.`allocateUtf8String(String str)`
Converts a Java string into a UTF-8 encoded, null-terminated C string, storing the result into a memory segment.
`MemorySegmentPREVIEW`
MemorySegment.`asReadOnly()`
Returns a read-only view of this segment.
`MemorySegmentPREVIEW`
MemorySegment.`asSlice(long offset)`
Returns a slice of this memory segment, at the given offset.
`MemorySegmentPREVIEW`
MemorySegment.`asSlice(long offset, long newSize)`
Returns a slice of this memory segment, at the given offset.
`MemorySegmentPREVIEW`
MemorySegment.`asSlice(long offset, long newSize, long byteAlignment)`
Returns a slice of this memory segment, at the given offset, with the provided alignment constraint.
`default MemorySegmentPREVIEW`
MemorySegment.`asSlice(long offset, MemoryLayoutPREVIEW layout)`
Returns a slice of this memory segment with the given layout, at the given offset.
`default MemorySegmentPREVIEW`
MemorySegment.`copyFrom(MemorySegmentPREVIEW src)`
Performs a bulk copy from given source segment to this segment.
`MemorySegmentPREVIEW`
MemorySegment.`fill(byte value)`
Fills the contents of this memory segment with the given value.
`default MemorySegmentPREVIEW`
MemorySegment.`get(AddressLayoutPREVIEW layout, long offset)`
Reads an address from this segment at the given offset, with the given layout.
`default MemorySegmentPREVIEW`
MemorySegment.`getAtIndex(AddressLayoutPREVIEW layout, long index)`
Reads an address from this segment at the given at the given index, scaled by the given layout size.
`static MemorySegmentPREVIEW`
MemorySegment.`ofAddress(long address)`
Creates a zero-length native segment from the given address valuePREVIEW.
`static MemorySegmentPREVIEW`
MemorySegment.`ofArray(byte[] byteArray)`
Creates a heap segment backed by the on-heap region of memory that holds the given byte array.
`static MemorySegmentPREVIEW`
MemorySegment.`ofArray(char[] charArray)`
Creates a heap segment backed by the on-heap region of memory that holds the given char array.
`static MemorySegmentPREVIEW`
MemorySegment.`ofArray(double[] doubleArray)`
Creates a heap segment backed by the on-heap region of memory that holds the given double array.
`static MemorySegmentPREVIEW`
MemorySegment.`ofArray(float[] floatArray)`
Creates a heap segment backed by the on-heap region of memory that holds the given float array.
`static MemorySegmentPREVIEW`
MemorySegment.`ofArray(int[] intArray)`
Creates a heap segment backed by the on-heap region of memory that holds the given int array.
`static MemorySegmentPREVIEW`
MemorySegment.`ofArray(long[] longArray)`
Creates a heap segment backed by the on-heap region of memory that holds the given long array.
`static MemorySegmentPREVIEW`
MemorySegment.`ofArray(short[] shortArray)`
Creates a heap segment backed by the on-heap region of memory that holds the given short array.
`static MemorySegmentPREVIEW`
MemorySegment.`ofBuffer(Buffer buffer)`
Creates a memory segment that is backed by the same region of memory that backs the given `Buffer` instance.
`MemorySegmentPREVIEW`
MemorySegment.`reinterpret(long newSize)`
Returns a new memory segment that has the same address and scope as this segment, but with the provided size.
`MemorySegmentPREVIEW`
MemorySegment.`reinterpret(long newSize, ArenaPREVIEW arena, Consumer<MemorySegmentPREVIEW> cleanup)`
Returns a new segment with the same address as this segment, but with the provided size and scope.
`MemorySegmentPREVIEW`
MemorySegment.`reinterpret(ArenaPREVIEW arena, Consumer<MemorySegmentPREVIEW> cleanup)`
Returns a new memory segment with the same address and size as this segment, but with the provided scope.
`MemorySegmentPREVIEW`
Linker.`upcallStub(MethodHandle target, FunctionDescriptorPREVIEW function, ArenaPREVIEW arena, Linker.OptionPREVIEW... options)`
Creates an upcall stub which can be passed to other foreign functions as a function pointer, associated with the given arena.
Methods in java.lang.foreign that return types with arguments of type MemorySegmentPREVIEW
Modifier and Type
Method
Description
`Optional<MemorySegmentPREVIEW>`
MemorySegment.`asOverlappingSlice(MemorySegmentPREVIEW other)`
Returns a slice of this segment that is the overlap between this and the provided segment.
`Stream<MemorySegmentPREVIEW>`
MemorySegment.`elements(MemoryLayoutPREVIEW elementLayout)`
Returns a sequential `Stream` over disjoint slices (whose size matches that of the specified layout) in this segment.
`Optional<MemorySegmentPREVIEW>`
SymbolLookup.`find(String name)`
Returns the address of the symbol with the given name.
`Spliterator<MemorySegmentPREVIEW>`
MemorySegment.`spliterator(MemoryLayoutPREVIEW elementLayout)`
Returns a spliterator for this memory segment.
Methods in java.lang.foreign with parameters of type MemorySegmentPREVIEW
Modifier and Type
Method
Description
`default MemorySegmentPREVIEW`
SegmentAllocator.`allocate(AddressLayoutPREVIEW layout, MemorySegmentPREVIEW value)`
Allocates a memory segment with the given layout and initializes it with the given address value.
`Optional<MemorySegmentPREVIEW>`
MemorySegment.`asOverlappingSlice(MemorySegmentPREVIEW other)`
Returns a slice of this segment that is the overlap between this and the provided segment.
`static void`
MemorySegment.`copy(MemorySegmentPREVIEW srcSegment, long srcOffset, MemorySegmentPREVIEW dstSegment, long dstOffset, long bytes)`
Performs a bulk copy from source segment to destination segment.
`static void`
MemorySegment.`copy(MemorySegmentPREVIEW srcSegment, ValueLayoutPREVIEW srcElementLayout, long srcOffset, MemorySegmentPREVIEW dstSegment, ValueLayoutPREVIEW dstElementLayout, long dstOffset, long elementCount)`
Performs a bulk copy from source segment to destination segment.
`static void`
MemorySegment.`copy(MemorySegmentPREVIEW srcSegment, ValueLayoutPREVIEW srcLayout, long srcOffset, Object dstArray, int dstIndex, int elementCount)`
Copies a number of elements from a source memory segment to a destination array.
`static void`
MemorySegment.`copy(Object srcArray, int srcIndex, MemorySegmentPREVIEW dstSegment, ValueLayoutPREVIEW dstLayout, long dstOffset, int elementCount)`
Copies a number of elements from a source array to a destination memory segment.
`default MemorySegmentPREVIEW`
MemorySegment.`copyFrom(MemorySegmentPREVIEW src)`
Performs a bulk copy from given source segment to this segment.
`MethodHandle`
Linker.`downcallHandle(MemorySegmentPREVIEW address, FunctionDescriptorPREVIEW function, Linker.OptionPREVIEW... options)`
Creates a method handle which is used to call a foreign function with the given signature and address.
`default long`
MemorySegment.`mismatch(MemorySegmentPREVIEW other)`
Finds and returns the offset, in bytes, of the first mismatch between this segment and the given other segment.
`static long`
MemorySegment.`mismatch(MemorySegmentPREVIEW srcSegment, long srcFromOffset, long srcToOffset, MemorySegmentPREVIEW dstSegment, long dstFromOffset, long dstToOffset)`
Finds and returns the relative offset, in bytes, of the first mismatch between the source and the destination segments.
`static SegmentAllocatorPREVIEW`
SegmentAllocator.`prefixAllocator(MemorySegmentPREVIEW segment)`
Returns a segment allocator which responds to allocation requests by recycling a single segment.
`long`
MemorySegment.`segmentOffset(MemorySegmentPREVIEW other)`
Returns the offset, in bytes, of the provided segment, relative to this segment.
`default void`
MemorySegment.`set(AddressLayoutPREVIEW layout, long offset, MemorySegmentPREVIEW value)`
Writes an address into this segment at the given offset, with the given layout.
`default void`
MemorySegment.`setAtIndex(AddressLayoutPREVIEW layout, long index, MemorySegmentPREVIEW value)`
Writes an address into this segment at the given index, scaled by the given layout size.
`static SegmentAllocatorPREVIEW`
SegmentAllocator.`slicingAllocator(MemorySegmentPREVIEW segment)`
Returns a segment allocator which responds to allocation requests by returning consecutive slices obtained from the provided segment.
Method parameters in java.lang.foreign with type arguments of type MemorySegmentPREVIEW
Modifier and Type
Method
Description
`MemorySegmentPREVIEW`
MemorySegment.`reinterpret(long newSize, ArenaPREVIEW arena, Consumer<MemorySegmentPREVIEW> cleanup)`
Returns a new segment with the same address as this segment, but with the provided size and scope.
`MemorySegmentPREVIEW`
MemorySegment.`reinterpret(ArenaPREVIEW arena, Consumer<MemorySegmentPREVIEW> cleanup)`
Returns a new memory segment with the same address and size as this segment, but with the provided scope.

## Uses of MemorySegmentPREVIEW in java.nio.channels

Methods in java.nio.channels that return MemorySegmentPREVIEW
Modifier and Type
Method
Description
`MemorySegmentPREVIEW`
FileChannel.`map(FileChannel.MapMode mode, long offset, long size, ArenaPREVIEW arena)`
Preview.
Maps a region of this channel's file into a new mapped memory segment, with the given offset, size and arena.

## Uses of MemorySegmentPREVIEW in jdk.incubator.vector

Methods in jdk.incubator.vector with parameters of type MemorySegmentPREVIEW
Modifier and Type
Method
Description
`static ByteVector`
ByteVector.`fromMemorySegment(VectorSpecies<Byte> species, MemorySegmentPREVIEW ms, long offset, ByteOrder bo)`
Loads a vector from a memory segmentPREVIEW starting at an offset into the memory segment.
`static ByteVector`
ByteVector.`fromMemorySegment(VectorSpecies<Byte> species, MemorySegmentPREVIEW ms, long offset, ByteOrder bo, VectorMask<Byte> m)`
Loads a vector from a memory segmentPREVIEW starting at an offset into the memory segment and using a mask.
`static DoubleVector`
DoubleVector.`fromMemorySegment(VectorSpecies<Double> species, MemorySegmentPREVIEW ms, long offset, ByteOrder bo)`
Loads a vector from a memory segmentPREVIEW starting at an offset into the memory segment.
`static DoubleVector`
DoubleVector.`fromMemorySegment(VectorSpecies<Double> species, MemorySegmentPREVIEW ms, long offset, ByteOrder bo, VectorMask<Double> m)`
Loads a vector from a memory segmentPREVIEW starting at an offset into the memory segment and using a mask.
`static FloatVector`
FloatVector.`fromMemorySegment(VectorSpecies<Float> species, MemorySegmentPREVIEW ms, long offset, ByteOrder bo)`
Loads a vector from a memory segmentPREVIEW starting at an offset into the memory segment.
`static FloatVector`
FloatVector.`fromMemorySegment(VectorSpecies<Float> species, MemorySegmentPREVIEW ms, long offset, ByteOrder bo, VectorMask<Float> m)`
Loads a vector from a memory segmentPREVIEW starting at an offset into the memory segment and using a mask.
`static IntVector`
IntVector.`fromMemorySegment(VectorSpecies<Integer> species, MemorySegmentPREVIEW ms, long offset, ByteOrder bo)`
Loads a vector from a memory segmentPREVIEW starting at an offset into the memory segment.
`static IntVector`
IntVector.`fromMemorySegment(VectorSpecies<Integer> species, MemorySegmentPREVIEW ms, long offset, ByteOrder bo, VectorMask<Integer> m)`
Loads a vector from a memory segmentPREVIEW starting at an offset into the memory segment and using a mask.
`static LongVector`
LongVector.`fromMemorySegment(VectorSpecies<Long> species, MemorySegmentPREVIEW ms, long offset, ByteOrder bo)`
Loads a vector from a memory segmentPREVIEW starting at an offset into the memory segment.
`static LongVector`
LongVector.`fromMemorySegment(VectorSpecies<Long> species, MemorySegmentPREVIEW ms, long offset, ByteOrder bo, VectorMask<Long> m)`
Loads a vector from a memory segmentPREVIEW starting at an offset into the memory segment and using a mask.
`static ShortVector`
ShortVector.`fromMemorySegment(VectorSpecies<Short> species, MemorySegmentPREVIEW ms, long offset, ByteOrder bo)`
Loads a vector from a memory segmentPREVIEW starting at an offset into the memory segment.
`static ShortVector`
ShortVector.`fromMemorySegment(VectorSpecies<Short> species, MemorySegmentPREVIEW ms, long offset, ByteOrder bo, VectorMask<Short> m)`
Loads a vector from a memory segmentPREVIEW starting at an offset into the memory segment and using a mask.
`Vector<E>`
VectorSpecies.`fromMemorySegment(MemorySegmentPREVIEW ms, long offset, ByteOrder bo)`
Loads a vector of this species from a memory segmentPREVIEW starting at an offset into the memory segment.
`final void`
ByteVector.`intoMemorySegment(MemorySegmentPREVIEW ms, long offset, ByteOrder bo)`
Stores this vector into a memory segmentPREVIEW starting at an offset using explicit byte order.
`final void`
ByteVector.`intoMemorySegment(MemorySegmentPREVIEW ms, long offset, ByteOrder bo, VectorMask<Byte> m)`
Stores this vector into a memory segmentPREVIEW starting at an offset using explicit byte order and a mask.
`final void`
DoubleVector.`intoMemorySegment(MemorySegmentPREVIEW ms, long offset, ByteOrder bo)`
Stores this vector into a memory segmentPREVIEW starting at an offset using explicit byte order.
`final void`
DoubleVector.`intoMemorySegment(MemorySegmentPREVIEW ms, long offset, ByteOrder bo, VectorMask<Double> m)`
Stores this vector into a memory segmentPREVIEW starting at an offset using explicit byte order and a mask.
`final void`
FloatVector.`intoMemorySegment(MemorySegmentPREVIEW ms, long offset, ByteOrder bo)`
Stores this vector into a memory segmentPREVIEW starting at an offset using explicit byte order.
`final void`
FloatVector.`intoMemorySegment(MemorySegmentPREVIEW ms, long offset, ByteOrder bo, VectorMask<Float> m)`
Stores this vector into a memory segmentPREVIEW starting at an offset using explicit byte order and a mask.
`final void`
IntVector.`intoMemorySegment(MemorySegmentPREVIEW ms, long offset, ByteOrder bo)`
Stores this vector into a memory segmentPREVIEW starting at an offset using explicit byte order.
`final void`
IntVector.`intoMemorySegment(MemorySegmentPREVIEW ms, long offset, ByteOrder bo, VectorMask<Integer> m)`
Stores this vector into a memory segmentPREVIEW starting at an offset using explicit byte order and a mask.
`final void`
LongVector.`intoMemorySegment(MemorySegmentPREVIEW ms, long offset, ByteOrder bo)`
Stores this vector into a memory segmentPREVIEW starting at an offset using explicit byte order.
`final void`
LongVector.`intoMemorySegment(MemorySegmentPREVIEW ms, long offset, ByteOrder bo, VectorMask<Long> m)`
Stores this vector into a memory segmentPREVIEW starting at an offset using explicit byte order and a mask.
`final void`
ShortVector.`intoMemorySegment(MemorySegmentPREVIEW ms, long offset, ByteOrder bo)`
Stores this vector into a memory segmentPREVIEW starting at an offset using explicit byte order.
`final void`
ShortVector.`intoMemorySegment(MemorySegmentPREVIEW ms, long offset, ByteOrder bo, VectorMask<Short> m)`
Stores this vector into a memory segmentPREVIEW starting at an offset using explicit byte order and a mask.
`abstract void`
Vector.`intoMemorySegment(MemorySegmentPREVIEW ms, long offset, ByteOrder bo)`
Stores this vector into a memory segmentPREVIEW starting at an offset using explicit byte order.
`abstract void`
Vector.`intoMemorySegment(MemorySegmentPREVIEW ms, long offset, ByteOrder bo, VectorMask<E> m)`
Stores this vector into a memory segmentPREVIEW starting at an offset using explicit byte order and a mask.